Glenn,
I know what you mean. I do some real-estate transaction work, and the local township is insisting that before a house can be sold, a receptacle must be installed in bathrooms & powder rooms that don't have them. They suggest tying into the fixture. This is always a 15 amp general lighting ckt. I struggle with this, but the township(AHJ) permits it. I would prefer to run a new ckt., but this could cost a few hundred dollars. In your case though, the additional cost of a new circuit might not make that much difference on a total remodel.
